CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Net income	$ 13,997	$ 20,653	$ 2,451	$ 1,874
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Change in unrealized gain on available-for-sale securities, net of tax	234	(60)	256	(24)
Change in cumulative translation adjustment	7,516	8,837	4,693	(3,411)
Other comprehensive income (loss)	12,157	12,165	6,507	(7,125)
Total comprehensive income (loss)	26,154	32,818	8,958	(5,251)
Foreign Exchange Forward | Cash Flow Hedging
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Change in unrealized loss on foreign currency forward contracts and forward starting interest rate swaps, net of tax	3,984	3,041	1,464	(1,472)
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Change in unrealized loss on foreign currency forward contracts and forward starting interest rate swaps, net of tax	$ 423	$ 347	$ 94	$ (2,218)